Conductive Paste with Metallic Glass for Solar Cell Electrodes
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Solution Overview
Problem
Solar cells face inefficiencies due to charge loss during the conversion of solar energy into electrical energy, primarily because existing conductive pastes do not effectively minimize electron-hole pair recombination and contact resistance at the electrode-semiconductor interface.
Innovation Solution
A conductive paste comprising a conductive powder, a metallic glass with specific elements having a heat of mixing value less than 0, and an organic vehicle is used, where the metallic glass forms a solid solution with the conductive powder and diffuses into the semiconductor substrate, reducing contact resistance and enhancing electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional conductive paste is used, then the solar cell can be manufactured with standard processes, but charge loss occurs due to high contact resistance and electron-hole pair recombination at the electrode-semiconductor interface
Solution Approach 1:
The patent changes the chemical composition parameters of the conductive paste by incorporating metallic glass particles with specific elements (Al, Si, B, P) that have negative heat of mixing values with silver. This compositional parameter change modifies the interfacial properties between the electrode and semiconductor, reducing contact resistance and minimizing charge loss during operation.
Solution Approach 2:
The conductive paste is formulated as a composite material containing silver powder, metallic glass particles, and organic vehicle. The metallic glass component acts as an interfacial modification layer that improves the electrical contact between the silver electrode and the semiconductor substrate, thereby reducing contact resistance and charge recombination losses.
2Temperature
If the firing temperature is reduced to 1000°C or lower, then energy consumption and equipment requirements are reduced, but the formation of solid solution and diffusion of metallic glass into semiconductor may be insufficient
Solution Approach 1:
The patent utilizes the negative heat of mixing parameter of specific metallic glass elements (Al, Si, B, P) with silver to enable solid solution formation and diffusion at reduced firing temperatures (≤1000°C). This thermodynamic parameter allows the metallic glass to react with the semiconductor substrate at lower temperatures than conventional processes, maintaining compositional stability while reducing energy input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed conductive paste significantly reduces charge loss and improves the efficiency of solar cells by minimizing contact resistance and electron-hole pair recombination, leading to higher energy conversion efficiency.
Implementation Method 1
the metallic glass forms a solid solution with the conductive powder
Implementation Method 2
diffuses into the semiconductor substrate, reducing contact resistance and enhancing electron transfer
Implementation Method 3
minimizing contact resistance and electron-hole pair recombination
Data Source
AI summary
A conductive paste may include a conductive powder, a metallic glass including a first element having a heat of mixing value with the conductive powder of less than 0, and an organic vehicle, and an electronic device and a solar cell may include an electrode formed using the conductive paste.